18255663 has 12 divisors (see below), whose sum is σ = 26504400. Its totient is φ = 12108096.

The previous prime is 18255659. The next prime is 18255707. The reversal of 18255663 is 36655281.

It is not a de Polignac number, because 18255663 - 2² = 18255659 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18255623) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3306 + ... + 6887.

It is an arithmetic number, because the mean of its divisors is an integer number (2208700).

Almost surely, 2^18255663 is an apocalyptic number.

18255663 is a deficient number, since it is larger than the sum of its proper divisors (8248737).

18255663 is a wasteful number, since it uses less digits than its factorization.

18255663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10398 (or 10395 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 18255663 is about 4272.6646252661. The cubic root of 18255663 is about 263.3091008341.

The spelling of 18255663 in words is "eighteen million, two hundred fifty-five thousand, six hundred sixty-three".